Related Experiment Video
Updated: Apr 15, 2026
11:33
Transcranial Magnetic Stimulation for Investigating Causal Brain-behavioral Relationships and their Time Course
Published on: July 18, 2014
44.3K
Transcranial Magnetic Stimulation Changes Response Selectivity of Neurons in the Visual Cortex
Taekjun Kim1, Elena A Allen2, Brian N Pasley2
1Vision Science Graduate Group, School of Optometry, University of California, Berkeley, CA 94720, USA.
Brain Stimulation
|April 12, 2015
Summary
Transcranial magnetic stimulation (TMS) alters visual cortex neuron tuning, causing long-lasting suppression and emphasizing higher spatial frequencies. This suggests TMS disrupts the balance of neural inputs.
Area of Science:
- Neuroscience
- Sensory Physiology
Background:
- Transcranial magnetic stimulation (TMS) modulates cortical neuronal activity.
- TMS effects on sensory neuron tuning properties remain quantitatively unstudied.
Purpose of the Study:
- Investigate how specific TMS parameters alter visual cortex neuron tuning characteristics.
- Quantify changes in orientation, spatial frequency, and contrast sensitivity.
Main Methods:
- Recorded single unit spikes from cat visual cortex.
- Applied repetitive TMS (4 Hz, 4 s) using a figure-8 coil.
- Analyzed pre- and post-TMS tuning parameters using Wilcoxon signed-rank test.
Main Results:
- Observed long-lasting suppression of neuronal activity post-TMS.
- TMS narrowed orientation tuning curves and emphasized higher spatial frequencies.
- Contrast tuning exhibited nonlinear changes, indicating gain control.
Conclusions:
- TMS induces extended interruption of sub-cortical and intra-cortical input balance.
- Findings provide quantitative insights into TMS effects on sensory processing.
